• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.423-428
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• 2006

Twenty nine HRV models have been tested for last two years since the attestation system has been started by KARSE. It is the objective of the present study to analyze the performance test results. Uncertainty analysis has been conducted to find the effects of measured variables on the uncertainties of test results. The uncertainty of enthalpy is found to be affected by the uncertainty of wet bulb temperature significantly, but not by that of dry bulb temperature for the present range of parameters. The uncertainty of effective enthalpy efficiency is calculated to be 6%P for the cooling condition, and 3%P for the heating condition approximately. In order to reduce the uncertainty of the test results, the uncertainty of wet bulb temperature should be minimized and the indoor/outdoor test conditions should be modified so as to increase the enthalpy difference.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제14권8호
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• pp.773-777
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• 2008

오늘날의 모바일 장비들은 무작위로 움직이는 이동성을 가지고 있어서 보안에 대한 다양한 요구사항을 가지고 있으며 이러한 요구사항을 충족시키기 위해 모바일 장비에 대한 보안기술과 인증기술에 대한 많은 연구가 진행 중이다. 이를 위하여 TCG(Trusted Computing Group)에서는 사용자의 프라이버시를 보호하는 동시에 강력한 인증방법을 제공하기 위하여 보안칩에 해당하는 TPM(Trusted Platform Module)을 설계하고 영지식 증명을 이용한 DAA(Direct Anonymous Attest처ion) 프로토콜을 제시하고 있다. 본 논문에서는 자바를 이용하여 DAA 프로토콜을 소프트웨어로 구현하고 이를 바탕으로 해서 모바일 환경에 적합한 모바일 DAA 모델을 제시한다.

• 설비공학논문집
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• 제20권9호
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• pp.608-613
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• 2008

The purpose of the present paper is to investigate the effect of outdoor weather conditions on the performance of a heat recovery ventilator. Experiments have been performed by varying outdoor temperature/humidity conditions with the indoor conditions fixed at the standard conditions by KARSE. Results indicate humidity efficiency shows larger uncertainties than temperature efficiency in general. With the heat generation by an internal fan removed, the modified temperature efficiency remains almost constant regardless of the indoor-outdoor temperature difference. The enthalpy efficiency can have very large or negative values in case the outdoor conditions are in the vicinity of the indoor enthalpy line. The direction of heat flow, in such a case, can be opposite to that of moisture flow between two air streams. Discussions are included about various interesting features of the psychrometric processes taking place in a heat recovery ventilator.